In some cases using the Build Cache feature can also help to speed up your builds.
Note: the efficiency of the Build Cache depends on the size of the files you want to cache,
as well as on the number of files you want to cache.
For more information see the Build Cache documentation.

All of our Xcode steps (Xcode Test, Xcode Archive and Xcode Analyze) have a "Do a clean Xcode build ...?" option.
You can usually turn off this option without causing any issues.

By turning off "clean build" you can speed up subsequent Xcode steps.
The first one will still have to do a full, clean build, because there's no build cache at the time it runs
(as every build runs in a brand new, clean Virtual Machine, as descibed in Code Security),
but subsequent Xcode steps can use the build cache of the previous Xcode step(s), reducing the compilation time of the step.